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"When we looked at what was available it became very clear that they contained at least some additives, preservers and 'improvers' - why would you want to put them into your body?

"Our white sliced sourdough contains just three ingredients - flour, water and seasalt."

The bread is now available in 35 branches of Waitrose and the couple hope to increase this number will increase to 100.

The Bertinets run a busy cookery school and also have a shop at 1 New Bond Street Place in the city.

The white sliced sourdough is one of 19 products from 16 local producers through to July's final and the competition will see the Bath bakery up against producers across the south west, the Scilly Isles and the Channel Islands.